Core barrel



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J. T. PHIPPS Oct. 15, 1929'.

n CORE BARREL- Filed Nov. 4 1926 n b, 1 if .5w/vm.. JOHN 7.79/9/ ,051

- Y 7:77" OPN/Sx 35 vention will be made hereinafter.

Patented @et 15, 1929. I

HUNTINGTON PANN,

mfr-ED straussl PATENT ori-ICE CALIFORNIA, AssIGNon rro H of SMITH MANUFACTURING COMPANY, OF WHITTIER, CALIFORNIA, A CORPORATION OF CALIFORNIA Application mea Nvember 4, 192e. serial No. 146,093.3

My invention relates to the oil well drilling industry and is particularly directed to 'core obtaining devices.

@have found that in order to be sureof ob- ,5 taining an integral core it is-necessarycthat Athe core drill produce a straight hole. If a crooked hole is drilled by the core drill, it is likely that the upper end formed will engage the side of the barrel,`th1s placing side strain on the core and usually *resnlting in its breakage. It is also necessary that the core drill cut evenly. It has been demonstrated that if a corebarrel cuts evenly an excellent corelis produced. It is an object of this invention to provide a core drill of the character mentioned which will cuta straight hole and 'will cut evenly.. The core drill of my invention has been designed'with careful consideration in an endeavor to proao vide a core drill which will produce an integral core.- j

I accomplish the above specified object of this invention by providing the core drill with a lower cutter vheady which supports cutting blades and-roller cutters. I have found that these two types of cutting elements combined as described hereinafterare effective in drilli ing a straight hole and in cutting evenly.

It is accordingly another object of this invention to provide a core drill with-a-cutter head having cutting blades and rollerl cutters which comprise the cutting elements thereof. Other objects and advantages of the4 in- Iteferring to the drawing in which I illustrate a preferred form of the invention,

Fig. 1 is a vertical sectional view of'a core` drill having the features of the invention.

Ifig. 2 is an enlarged section of the cutter head of the invention. Fig. 3'is a section taken on the line 3-3-of lllif. 2.

ig. 4 is an elevational view of Fig. 2 taken substantially ,as indicated by the arrow 4 of Fig.p2;1

Referring in detail to the drawing and particularly to Fig. 1, the core drill of the invention has a core barrel 11. This core b ar- LSQ rel 11 consists of an inner core retainer tube of the core being 12 and an outer shell 13. Formed integrally with the outer shell 13, at the lower end thereof, is a connector portion 15 having an eX- ternally threaded projection 16 to which a cutter head 17 is secured. The connector 15 is provided with. internal threads 19 above the cylindrical projection 16, by means of which the low' end of the tube 12 is attached to the shell 13. The upper end of the shell 13 is attached to a coupling 20 which is threadedly secured to a head 21. The upper end of the tube 12 is threadedly secured to the coupling 20 as indicated at 22. Threadedly secured inside the tube ,12 a slight distance below the coupling 20 is a plugv 24 having a tube 25 extending upwardly therefrom, this tube 25 extending partly ing 26 provided by the head 21. Openings 27 are provided in the tube 12 above the plug 24. These openings are provided for the purpose of conductinglubricating fluid such as rotary mud from the passage 26 of the head' 21 to an annular space28 formed between thetube' 12 and the shell 13. The connector 15 is provided with fluid outlet passages 29 which connect to the lower end of the annular space 28'. Lubricating luid is supplied to the cutter head 17 through these passages 29.

An important part of my' invention is embodied in the cutter head 17 which is shown in detail in Figs. 2 to 4 inclusive. Referring tothes-e figures, the cutter head has a core opening 32 formed therethrough. This core opening 32 isenlarged at 33 to receive a core catcher 34. The core catcher 34 is secured in the enlargement 33 by the lower end of the threaded projection 16 of the -connector 15 which 'is secured into 35 of the core opening 32. It should be noted that the core opening 32 is aligned with and is connected to a core receiving chamber 36 provided by the core barrel 11. Formed at the lower end of the cutter' head 17 are teeth 38 which are annularly arranged around the lower end of the' core opening 32.

fEXtending upwardly from the cutter head 17 and preferably formed integrally therewith are cutting blades 39. In the preferred form of the invention I provide two diametrically opposed blades 39, but if desired I may through a central open an upper threaded endl upward.

' tending through openings formed in the arms f ol each retainer 54 and each ear 65 1s a lockprovide a greater number. The blades 39 extend from the lower end to the upper end of the cutter head 17. The lower ends of the blades 29 are provided with cutting edges 42. The cutting edges 42, as shown best in"A Fig. 4, may be curved in a concave fashion so that outer portions 43 are somewhatabove the inner portions of the cutting edges 42.

Extendedoutwardly from the cutter head 17 are Vpins 45. These pins are formed integrally with the cutter head 17 and are arranged diametrically opposite each other and substantially centrally between the blades 34. This is clearly shown in Fig. 3. AsA shown best in Fig. 2, the pins 45 extend outward and Carriedby the pins 45 are roller cutters 46 having longitudinal teeth 47. The outer faces of the roller cutters 46 may be slightly conical. Placed between'the cutter head 17 and the roller cutters 46 are inner wear .plates 49 which rest partly. in.,annular recesses 5() of the cutter body 17 and partly in annular recesses 51 formed on the inner faces of the roller cutters 46. For the pur- 'pose of retaining the roller cutters' 46 on the pins 45, I provide retainers 54.-", The 4retainers 54 are provided with inner sockets 55 into which the outer ends of the pins 45 ex'- tend. The louter `faces of the roller cutters 46 are provided with recesses 56 in which outer wear plates 57 are placed. These wear plates 57 are adapted to take the wear between thevroller cutters 46. and faces 59 of the retainers 54. The retainers 54 are provided ywith arcuate channels 58, which are shown best in Figs. 2 and 4, through which the peripheral parts of the roller cutters 46 pass.

The upper 'parts of the retainers 54, as shown best in Figs. 2 and 4, are provided with upwardly extending arms 60 which are separated by spaces 61. As illustrated in Fig. 2, the cutter head 17 is provided with indentations 63 into which the inner parts of the arms 60 extend, these indentations serving as a bracing means for the arms, preventing them from being spread. Projecting outwardly from 'the cutter body 17 are ears 65. These ears 65 extend between pairs of indentations 63 and into the spaces 61 provided between the arms 6() of the retainers 54. Ex-

ing means in the form of a rod 66. Each rod 66 is riveted at its opposite ends as denoted at 67 in Fig. 4. The rods 66 serve the purpose of securing theretainers 54 to the cutter head 17.

In order that the outer parts of the blades- '39 operate on thesame plane as the roller` cutters 46,-it is'necessary to form the cutting edge 42 as illustrated' in Fig. 4. `When the core drill is in operation, as illustrated in Fig. 1, the blades 39 and the roller cutters.

46 cooperate to remove an annular area of material so that a central core 7 0 extends upribs as they are formed. Itis believed that' -it is because of this type ofjcutting action that the operation of the core drill is very smooth. The=` roller cutters 46 have an extensive cutting vsurface and will have a very long life. The cutting edges 42 of the blades 39 will-have a long life'because of the fact that they do not operate on a smooth surface, but on a corrugated surface. The roller cutters 46 have a rcamingaction 'on the hole and therefore true the hole as it is drilled.

' The features of the invention as heretofore pointed out are accomplished by the provision lof the cutting blades 39 and the roller cutters 46. y

I claim as my invention: I 1

1. In acore barrel, the combination of: av

barrel; acutter headattached tothe lower end of said barrel, said cutter head having a core opening4 concentric with the axis of rotation of said barrel and connected with the interior thereof; blades extending outwardly from said vcutter head; and roller cutters carried by said cutter head, said roller cutters and said blades being adapted to cut the bottom .of said hole along the same concentric path of travel. f

2. In a core barrel, the combination of: a barrel; a cutter head attached to the lower end of said barrel, said cutter head having a core opening concentric with the axis of rotation of said barrel and connected with the interior thereof; blades extending outwardly from said cutter head; and roller cutters carried by said cutter head, said roller cutters ing from said cutter head; retainers for holding said roller cutters on said pins, said retainers having arms extending on each side of said ears; and rods extending through said arms and said ears.

4. In a core barrel, the combination of: a

. body,

barrel; a cutter head attached to the lower end ot said barrel, said cutter head having a core opening concentric with the axis or' rotation of said barrel and connected with the interior thereof; blades extending outwardly from said cutter head; pins extended outwardly from said cutter head; roller cutters rotatably carried byf said pins; ears extending from said cutter head above said pins; retainers for holdingsaid roller cutters on said pins, said retainers having arms extending on each 4side of said ears; and rods extending through said arms and said ears. 5. In a core barrel, the combination of: a

barrel; a cutter head attached to the lower end of said barrel, said `cutter head having a core opening concentric with the axis of rotation ofsaid barrel and connected with the interior thereof; teeth carried by said body,- said teeth surrounding the lower end of said core opening; blades extending outwardly from said cutter head, said blades bein adapted to scrape the bottom of the hole; and roller cutters carried by said cutter head,

vsaid roller cutters being placed so as to out on the bottom of saidhole. V

- 6. In a core barrel, the combination of: a barrel; a cutter head attached to the'lower end 'of said barrel, said cutter head having a core opening concentric with the axis of rotation of said barrel and connected with the interior thereof; teeth carriedl by said said teeth surrounding the lower-end of said core opening; blades extending'otwardly from said cutter head; pins extendedl outwardly from said cutter head; roller cutters rotatably carried by said pins, said roller cutters and said blades being adapted'to cut the bottom of the hole; and means for holding said roller'cutters onsaid pins.

' scrape the said pins7 said retainers having arms extending 'on each'side of. said ears; and rods extending through said arms and said ears.

9. In a core barrel cutterheadconstrucl the combination or: blades adapted to bottomv of the hole; and rotaryT cutters adapted to cut corrugati'ons in the bottom of said .10, In a core barrel cutter head construction, the combination of: blades associated with said head, said blades being adapted tov tion,

scrape the bottom of the hole; pins extending outwardly from said head; roller cutters rotatably carried by said pins, said roller.

cutters being adapted to 4cut the1 bottom of' said hole; ears associated with' said head; retainers for holding said "roller cutters on hole in the path of said blades.

said pins, said retainers having arms extend` 1' ing on each side of said ears; and rods extending -through said arms and said ears. 11. In a core barrel cutter head construction, the combination of a body pins eXtnding outwardly fromsaid body; roller cutters.

rotatably' carried by. said pins, said roller cutters being adapted to out the bottom Aof said hole; ears associated with said head; re-

tainers for holding said roller cutters on said. p1ns,-'sa1 d retainershaving arms extending on each side of sai 'd ears; and rods extending through said arms and saidears.

my hand atLos Angeles, California, this 30th day of October, 1926. l JOHN PI-IIPPS.

7. In a core barrel, 'the combination of: a

barrel; a cutter head vattached to the lower end of said barrel, said cutter head.'having a core opening concentric with the axis of ro- `tation of said barrel and connected with the interior thereof;vteeth carried by said body,

' said teeth surrounding the lower end of said rotatably carried by said'pins; ears extendy ing from said cutter head; retainers for holdlng said roller cutters on said pins, 'said retainers having arms extending on each side of said cars; and rods extending through said arms-and said ears.

8. In a core cutter, the combination of: a

Acutter head; blades formed on said cutter he-ad, said blades being adapted to scrape the bottom of the hole; pins extending outwardly from said cutter head; roller `cutters rotatably carried by said pins, said roller cutters being adapted to hole; ears extending rom said cutter head; retainers for holding said roller cutters on cut the bottom of said 95v In testimony whereof, I have hereunto set 

